186522-72-5Relevant academic research and scientific papers
Preparation, characterization, and reactivity studies of chelated substituted cyclopentadienylmanganesedicarbonyl complexes
Pang, Zhen,Johnston, Randy F.,VanDerveer, Don G.
, p. 25 - 32 (2007/10/03)
Chelates of the parent compounds (η5-C5H4C(O)CH2OCH3)Mn(CO)3 (1), (η5-C5H4C(O)CH2SCH3)Mn(CO)3 (2), (η5-C5H4C(O)CH2CH2SCH3)Mn(CO)3 (3), (η5-C5H4CH2COOCH3)Mn(CO)3 (4), and (η5-C5H4CH2CH2COOCH3)Mn(CO)3 (5) were prepared by photolysis. Only the chelates (η1:η 5-C 5 H 4C(O)CH 2SCH 3)Mn(CO)2 (2chelate) and (η 1:η 5-C5H4C(O)CH2CH2SCH3)Mn(CO)2 (3chelate) were stable enough to be isolated. The X-ray structure of 2chelate was determined and demonstrated ring strain in the chelate ring. Derivatives of the chelates were obtained by thermal substitution of the chelated group. Substitution of the chelated groups in (η1:η5-C5H4C(O)CH2OCH 3)Mn(CO)2 (1chelate), (η1:η5-C5H4CH2COOCH 3)Mn(CO)2 (4chelate), and (η1:η5-C5H4CH2CH2COOCH3)Mn(CO)2 (5chelate) occurred within a few minutes, whereas 2chelate and 3chelate required refluxing for several hours to convert them to the substituted products. The substituted products have the general formula (η5-C5H5R)Mn(CO)2L (where R is the substituent of either 1-5 and L is either a phosphine, phosphite, or tetrahydrothiophene). The weaker Mn-O bond was suggested for the differences in the reactivities of the chelated complexes.
